Assume without loss of generality that \(\)  has no anisotropic factors.
Let \(\tilde{}\)  be the simply connected covering of \(\) .
Following [1]}, \(\tilde{}(k)=\tilde{G}^+\) , so by Corollary REF , \(\tilde{G}^+\)  is sealed.
Since the quotient map, \(f\colon \tilde{}\rightarrow \)  is a central \(k\)  isogeny, we have by [1]} that \(f(\tilde{}(k)^+)=G^+\) , so \(G^+\)  is sealed as it is a quotient of a sealed group.
